By default, each SIMS user has no maximum amount of hard disk storage or quota that they can use for their mailboxes. They can use an unlimited amount of disk space for their incoming and stored messages. SIMS allows you to configure a quota for each Sun Message Store user. If you decide to implement user quotas, you can set a customized quota for each user, or you can set the default quota for a user. The default quota, which can also be changed, is 20 Mbytes. For complete details see "Message Store Quota Enforcement" on page 148.